Tubular heat exchanger and packaging method of tubular heat exchanger

ABSTRACT

A tubular heat exchanger includes an upper tube plate box, a lower tube plate box, a plurality of heat exchange tubes, and a pressure bolt. Each heat exchange tube includes an inlet end and an outlet end opposite to the inlet end, the inlet end passes through the upper tube plate box, the outlet end passes through the lower tube plate box, the first sealing rubber is filled in a gap between the plurality of heat exchange tubes and the upper tube plate box, and the second sealing rubber is filled in a gap between the plurality of the heat exchange tubes and lower tube plate box. The pressure bolt is located between the upper tube plate box and the lower tube plate box. The present application also relates to a packaging method of the tubular heat exchanger.

FIELD

The present application relates to a tubular heat exchanger and apackaging method of the tubular heat exchanger.

BACKGROUND

Tubular heat exchangers are widely used in the fields of cokingindustry, metallurgy, chemical industry, hazardous waste incinerationsystem, boiler industry, waste heat recovery system, and urban sewagetreatment, etc. Tubular heat exchangers are usually used in a harshenvironment, the working temperature and pressure of the heat exchangemedium are relatively high, and the use environment has certaincorrosiveness, which requires the packaging process between the heatexchange tubes of the tubular heat exchanger and the tube plate to havehigh performance indicators.

The connection methods between heat exchange tube and tube plate mainlyincludes expansion joint, welding, explosion connection, and expansionwelding connection, etc. Different connection methods will affect theconnection quality of heat exchange tube and tube plate. On the onehand, with the equivalent diameter of heat exchange tube decreases (suchas less than 1 mm) and tube wall becomes thinner (such as less than 0.1mm), the above-mentioned connection method will cause the tube wall ofthe heat exchange tube to rupture, and some connection methods are easyto block the heat exchange tube, which is time-consuming and laboriousto process. It is difficult to achieve large-scale processing, and theexpansion method is not suitable for the connection of non-circular heatexchange tubes (such as elliptical tubes, drop-shaped tubes) and tubeplates. On the other hand, for tubular heat exchangers used in specialoccasions (such as strong corrosiveness, etc.), when using non-metallicheat exchange tubes, the welding method or the expansion method is nolonger applicable, and improper processes will affect the use andlifespan of the heat exchanger.

Therefore, there is room for improvement in the art.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the embodiments can be better understood with referenceto the following drawings. The components in the drawings are notnecessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the embodiments. Moreover, in thedrawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 shows a schematic cross-sectional view of a tubular heatexchanger of one embodiment according to the present disclosure.

FIG. 2 shows a schematic top view of the tubular heat exchanger of oneembodiment according to the present disclosure.

FIG. 3 shows a flowchart of a packaging method of the tubular heatexchanger of one embodiment according to the present disclosure.

DETAILED DESCRIPTION

It will be appreciated that for simplicity and clarity of illustration,where appropriate, reference numerals have been repeated among thedifferent figures to indicate corresponding or analogous elements. Inaddition, numerous specific details are set forth in order to provide athorough understanding of the embodiments described herein. However, itwill be understood by those of ordinary skill in the art that theembodiments described herein can be practiced without these specificdetails. In other instances, methods, procedures, and components havenot been described in detail so as not to obscure the related relevantfeature being described. The drawings are not necessarily to scale, andthe proportions of certain parts may be exaggerated better illustratedetails and features. The description is not to be considered aslimiting the scope of the embodiments described herein.

The term “outside” refers to a region that is beyond the outermostconfines of a physical object. The term “inside” indicates that at leasta portion of a region is partially contained within a boundary formed bythe object. The term “substantially” is defined to essentiallyconforming to the particular dimension, shape or other word thatsubstantially modifies, such that the component need not be exact. Forexample, substantially cylindrical means that the object resembles acylinder, but can have one or more deviations from a true cylinder. Theterm “comprising” means “including, but not necessarily limited to”; itspecifically indicates open-ended inclusion or membership in aso-described combination, group, series and the like. It should be notedthat references to “an” or “one” embodiment in this disclosure are notnecessarily to the same embodiment, and such references mean at leastone.

Referring to FIGS. 1 and 2 , a tubular heat exchanger 10 is provided.The tubular heat exchanger 10 includes an upper tube plate box 1, alower tube plate box 11, and a plurality of heat exchange tubes 3. Eachof the plurality of heat exchange tubes 3 includes an inlet end and anoutlet end. The inlet ends of the plurality of heat exchange tubes 3pass through the upper tube plate box 1, and the outlet ends of theplurality of heat exchange tubes 3 pass through the lower tube plate box11. The shape of each of the upper tube plate box 1 and the lower tubeplate box 11 is not limited, and can be a rectangular parallelepiped, acube, or a cylinder, etc. The upper tube plate box 1 and the lower tubeplate box 11 play a fixed support and sealing role for the heat exchangetubes 3. In one embodiment, the upper tube plate box 1 and the lowertube plate box 11 are rectangular parallelepipeds. The structures of theupper tube plate box 1 and the lower tube plate box 11 are the same, theconnection manner of the upper tube plate box 1 and the plurality ofheat exchange tubes 3 is the same as the connection manner of the lowertube plate box 11 and the plurality of heat exchange tubes 3, thesealing manner of the upper tube plate box 1 and the plurality of heatexchange tubes 3 is the same as the sealing manner of the lower tubeplate box 11 and the plurality of heat exchange tubes 3. Therefore, inone embodiment, only the above upper tube plate box 1 is taken as anexample for detailed description.

The material of the plurality of heat exchange tubes 3 is not limited,and can be various types of non-metal tubes such as glass tubes, metaltubes, and the like. The cross-sectional shape of the heat exchange tube3 can be circular or non-circular, such as oval, drop shape, etc. Theequivalent diameter of the heat exchange tube 3 is in a range from 0.2mm to 200 mm. The arrangement of the heat exchange tubes 3 can bein-line or crossed, and the distance between two adjacent heat exchangetubes 3 is 0.8 to 3 times the equivalent diameter of the heat exchangetubes 3, but it is not limited to this. In one embodiment, the heatexchange tube 3 is a metal tube, the cross-sectional shape of the heatexchange tube 3 is circular, the diameter of the heat exchange tube 3 is0.5 mm, and the heat exchange tubes 3 are parallel to each other. Theheat exchange tubes 3 are normal pressure, slightly positive pressure ornegative pressure pipes, and a plurality of heat exchange tubes 3 arepositioned and fixed by the tube plates of the upper tube plate box 1and the lower tube plate box 11.

The upper tube plate box 1 includes an upper tube plate 4, a lower tubeplate 7 and a side plate 6. The upper tube plate 4, the lower tube plate7, and the side plate 6 form a cavity. The upper tube plate 4 defines aplurality of opening, the lower tube plate 7 defines a plurality ofopening, and the openings of the upper tube plate 4 and the openings ofthe lower tube plate 7 correspond one-to-one. There is a one-to-onerelationship between the multiple heat exchange tubes 3 and the multipleopenings. The upper tube plate 4, the lower tube plate 7, and the sideplates 6 can be fixed by bolts, or the upper tube plate box 1 can beformed by 3D printing. The inlet end of the heat exchange tube 3penetrates the corresponding openings of the upper tube plate 4 and thelower tube plate 7. The cavity of the upper tube plate box 1 is filledwith elastic sealing rubber, and the heat exchange tube 3 is fixed inthe cavity of the upper tube plate box 1 by the sealing rubber.Moreover, the sealing rubber is filled into the gap between the heatexchange tube 3 at the opening of the upper tube plate 4 and the uppertube plate 4, and the sealing rubber is also filled into the gap betweenthe heat exchange tube 3 at the opening of the lower tube plate 7 andthe lower tube plate 7, so that the heat exchange tube 3 is fixed andsealed with the upper tube plate 4 and the lower tube plate 7. In oneembodiment, the fixing and sealing of the heat exchange tube 3 and theupper tube plate 4 are only realized by sealing rubber, the fixing andsealing of the heat exchange tube 3 and the lower tube plate 7 are onlyrealized by sealing rubber, and other fixing and sealing methods are notincluded. The sealing rubber plays a role of sealing, flexible fixing,and restraint. The above-mentioned sealing rubber does not have aspecific type, and can be selected and used according to the specificapplication environment of the tubular heat exchanger 10. Specifically,the sealing rubber may be a silicone rubber series, a polysulfide rubberseries, a urethane rubber series, a diene rubber series, and the like.

The structure of the lower tube plate box 11 is the same as thestructure of the upper tube plate box 1 and will not be repeated here.

In one embodiment, a pressure bolt 9 is provided on the side plate 6 ofthe upper tube plate box 1, and the pressure bolt 9 is perpendicular tothe axial direction of the heat exchange tube 3. The pressure bolt 9 isused to apply and adjust the sealing pressure, so that a flexibleconnection mode between the heat exchange tube 3 and the tube plate isrealized. Of course, the position where the pressure bolt 9 is set isnot limited, and the pressure bolt 9 can also be set on the top orbottom plate of the upper tube plate box 1, as long as the sealingpressure can be applied and adjusted.

The tubular heat exchanger 10 further includes a connecting flange 8,the connecting flange 8 is connected to the tube plate box along theaxial direction of the heat exchange tube 3, and is used to install thehead box of the tubular heat exchanger 10.

The working temperature of the tubular heat exchanger 10 is not higherthan the normal use temperature of the sealing rubber. Generally, theworking temperature of the hot and cold fluid inside and outside of thetubular heat exchanger 10 is in a range from −70 degrees Celsius to 250degrees Celsius, and the working pressure can be normal pressure,slightly positive pressure, or negative pressure.

In one embodiment, the fixing and sealing method of the heat exchangetube 3 and the upper tube plate 4 is only realized by sealing rubber,the fixing and sealing method of the heat exchange tube 3 and the lowertube plate 7 is only realized by sealing rubber, and other fixing andsealing methods are not included. Therefore, this connection methodgreatly reduces the requirements on the shape of the heat exchange tube3. In addition, the diameter of the heat exchange tube 3 can be thinner,and the heat exchange tube 3 with an equivalent tube diameter of about100 microns can be used, and the tube wall can be thinner, and a heatexchange tube 3 with a wall thickness of tens of microns can be used.The tubular heat exchanger 10 with thinner and thinner heat exchangetubes 3 has better heat dissipation effect.

When the areas of the upper tube plate 4 and the lower tube plate 7 arelarge, and the pressure in the cavity of the upper tube plate box 1 ishigh, the upper tube plate 4 and the lower tube plate 7 are likely to bedeformed, thereby affecting the heat dissipation effect of the tubularheat exchanger 10. Therefore, along the axial direction of the heatexchange tube 3, a tie rod 2 is provided between the upper tube plate 4and the lower tube plate 7, so that the upper tube plate 4 and the lowertube plate 7 are rigidly fixed. The two ends of the tie rod 2 arerespectively fixed on the upper tube plate 4 and the lower tube plate 7,one end of the tie rod 2 is welded to the upper tube plate 4 or thelower tube plate 7, and the other end of the tie rod 2 is fixed to thelower tube plate 7 or the upper tube plate 4 by welding, screwconnection or bolt-nut connection, thereby preventing the deformation ofthe upper tube plate 4 and the lower tube plate 7, maintaining thepressure in the cavity of the upper tube plate box 1, and increasing therigidity of the upper tube plate box 1. The number of tie rods 2 and thedistance between tie rods 2 can be calculated according to actualapplications. Specifically, the tie rod 2 can be made of a metalmaterial that is resistant to the corrosion of the sealing rubber. Forexample, the tie rod 2 can be made of iron, copper, aluminum, stainlesssteel, and so on. In one embodiment, the tie rod 2 can be an iron rod.It can be understood that the tube plate boxes 1, 11 and the tie rods 2can also be integrally formed by mechanical cutting and weldingprocessing, or 3D printing.

The two opposite ends of the heat exchange tube 3 respectively passthrough the tube plates of the upper tube plate box 1 and the lower tubeplate box 11, and are fixed and connected by sealing rubber and pressurebolts 9. The sizes of the tube plate boxes 1, 11 can be selectedaccording to the number of the heat exchange tubes 3, and the tubediameter of the heat exchange tubes 3, and the distance between twoadjacent heat exchange tubes 3. The tube plates on both sides of thetube plate box are fixed by the tie rods 2. Through the sealing rubber,pressure bolts 9, and tie rods 2 filled in the tube plate boxes 1, 11, arigid and flexible connection between the tubes and the tube plate isrealized.

In addition, the embodiment of the present application provides apackaging method of the tubular heat exchanger 10. Referring to FIG. 3 .The packaging method of the tubular heat exchanger 10 includes thefollowing steps:

S1, provide an upper tube plate box 1, a lower tube plate box 11, and aplurality of heat exchange tubes 3, wherein the upper tube plate box 1defines multiple openings, the lower tube plate box 11 defines multipleopenings, and the plurality of heat exchange tubes pass through theopenings of the upper tube plate box 1 and the lower tube plate box 11;

S2, filling the upper tube plate box 1 and the lower tube plate box 11with liquid sealing rubber, wherein the liquid sealing rubber is filledin the gap between the heat exchange tube 3 and the upper tube plate box1, the liquid sealing rubber is also filled in the gap between the heatexchange tube 3 and the lower tube plate box 11, and then the liquidsealing rubber is solidified, so that multiple heat exchange tubes 3 aresealed and fixed in the upper tube plate box 1 and the lower tube platebox 11; and

S3, installing the pressure bolts 9 on the upper tube plate box 1 andthe lower tube plate box 11 to apply and adjust the sealing pressure.

During step S1, the upper tube plate box 1 includes an upper tube plate4, a lower tube plate 7 and a side plate 6. The upper tube plate 4, thelower tube plate 7, and the side plate 6 form a cavity. The upper tubeplate 4 defines a plurality of opening, the lower tube plate 7 defines aplurality of opening, and the openings of the upper tube plate 4 and theopenings of the lower tube plate 7 correspond one-to-one. The upper tubeplate 4, the lower tube plate 7, and the side plates 6 can be fixed bybolts, or the upper tube plate box 1 can be formed by mechanical cuttingand welding processing or 3D printing. The structure of the lower tubeplate box 11 is the same as the structure of the upper tube plate box 1and will not be repeated here.

The material of the plurality of heat exchange tubes 3 is not limited,and can be various types of non-metal tubes such as glass tubes, metaltubes, and the like. The cross-sectional shape of the heat exchange tube3 can be circular or non-circular, such as oval, drop shape, etc. Theequivalent diameter of the heat exchange tube 3 is in a range from 0.2mm to 200 mm. The arrangement of the heat exchange tubes 3 can bein-line or crossed, and the distance between two adjacent heat exchangetubes 3 is 0.8 to 3 times the equivalent diameter of the heat exchangetubes 3, but it is not limited to this. The heat exchange tubes 3 arenormal pressure, slightly positive pressure or negative pressure pipes.The inlet ends of the plurality of heat exchange tubes 3 pass throughthe upper tube plate box 1, and the outlet ends of the plurality of heatexchange tubes 3 pass through the lower tube plate box 11. The heatexchange tubes 3 are positioned and fixed by the tube plates of theupper tube plate box 1 and the lower tube plate box 11. In oneembodiment, the heat exchange tube 3 is a metal tube, thecross-sectional shape of the heat exchange tube 3 is circular, thediameter of the heat exchange tube 3 is 0.5 mm, and the heat exchangetubes 3 are parallel to each other.

During step 2, the upper tube plate box 1 and the lower tube plate box11 are filled with the liquid sealing rubber. The liquid sealing rubberis filled in the gap formed between the heat exchange tube 3 and theupper tube plate box 1, the liquid sealing rubber is also filled in thegap formed between the heat exchange tube 3 and the lower tube plate box11, and then the liquid sealing rubber is solidified, so that multipleheat exchange tubes 3 are sealed and fixed in the upper tube plate box 1and the lower tube plate box 11. Since the liquid sealing rubber hasgood fluidity, as long as the filling amount is sufficient, the liquidsealing rubber can flow into the gap formed between the heat exchangetube 3 and the upper tube plate box 1, and the gap formed between theheat exchange tube 3 and the lower tube plate box 11. When the liquidsealing rubber is cured, the liquid sealing rubber solidifies into asolid sealing rubber and becomes an elastic body. The sealing rubber isfilled into the gap between the heat exchange tube 3 at the opening ofthe upper tube plate 4 and the upper tube plate 4, and the sealingrubber is also filled into the gap between the heat exchange tube 3 atthe opening of the lower tube plate 7 and the lower tube plate 7. Thereis no specific type of liquid sealing rubber, and the liquid sealingrubber can be selected and used according to the specific applicationenvironment of the tubular heat exchanger 10. The viscosity of theliquid sealing rubber ranges from 500 mpa·s to 100000 mpa·s. In oneembodiment, the viscosity of the liquid sealing rubber ranges from 2000mpa·s to 20000 mpa·s. Specifically, the liquid sealing rubber can be asilicone rubber series, a polysulfide rubber series, a urethane rubberseries, a diene rubber series, and the like. In one embodiment, theliquid sealing rubber is a liquid silicone rubber series.

It is understandable that the sealing rubber can also be in granular orpowder form before filling the upper tube plate box 1 and the lower tubeplate box 11. When the granular or powdered sealing rubber is filledinto the upper tube plate box 1 and the lower tube plate box 11, thegranular or powdered sealing rubber must undergo high temperature tosoften into fluid, and then the fluid is filled into the upper tubeplate box 1 and the lower tube plate box 11.

During step 3, the pressure bolts 9 are installed on the upper tubeplate box 1 and the lower tube plate box 11, and the sealing pressure isapplied and adjusted by the pressure bolts 9 to realize the flexibleconnection between the heat exchange tube 3 and the tube plate. In oneembodiment, the pressure bolts 9 are installed on the side plates 6 ofthe upper tube plate box 1 and the lower tube plate box 11, and thepressure bolts 9 are installed in a direction perpendicular to the heatexchange tube 3.

The upper tube plate box 1 and the lower tube plate box 11 are filledwith sealing rubber. The sealing rubber can withstand high and lowtemperatures, has good elasticity and incompressibility, and has a wideoperating temperature range. The sealing rubber is filled into the gapbetween the heat exchange tube 3 and the tube plate, and the sealingrubber plays a role of sealing and flexible fixing. When the pressurebolts 9 are installed in the upper tube plate box 1 and the lower tubeplate box 11, due to the incompressibility of the sealing rubber, assoon as the sealing rubber is squeezed, the pressure rises, and thesealing rubber is squeezed into the gap between the heat exchange tube 3and the openings of and the tube plate, so that the heat exchange tube 3and the tube plate is sealed and fixed.

During step 1, when the areas of the upper tube plate box 1 and thelower tube plate box 11 are large, and the pressure in the cavity of theupper tube plate box 1 and the lower tube plate box 11 are high, theupper tube plates 4 and the lower tube plates 7 of the upper tube platebox 1 and the lower tube plate box 11 are likely to be deformed, whichwill affect the heat dissipation effect of the tubular heat exchanger10. Therefore, along the axial direction of the heat exchange tube 3, atie rod 2 is located between the upper tube plate 4 and the lower tubeplate 7 to rigidly fix the upper tube plate 4 and the lower tube plate7. The two opposite ends of the tie rod 2 are respectively fixed on theupper tube plate 4 and the lower tube plate 7. One end of the tie rod 2is welded to the upper tube plate 4 or the lower tube plate 7, and theother end of the tie rod 2 is fixed to the lower tube plate 7 or theupper tube plate 4 by welding, screw connection or bolt-nut connection,thereby preventing the deformation of the upper tube plate 4 and thelower tube plate 7, maintaining the pressure in the cavities of theupper tube plate box 1 and the lower tube plate box 11, and increasingthe rigidity of the upper tube plate box 1 and the lower tube plate box11. The number of tie rods 2 and the distance between two adjacent tierods 2 can be calculated according to actual applications. Specifically,the tie rod 2 can be made of a metal material that is resistant to thecorrosion of the sealing rubber. For example, the tie rod 2 can be madeof iron, copper, aluminum, stainless steel, and so on. It can beunderstood that the tube plate box 1, 11 and the tie rods 2 can also beintegrally formed by mechanical cutting and welding processing, or 3Dprinting.

The packaging method of the tubular heat exchanger 10 in the embodimentof the present application changes the connection mode (welding,expansion joint, expansion welding combination, etc.) of the traditionaltubular heat exchange and the tube plate. Through the elasticity,fluidity and incompressibility of the sealing rubber, the heat exchangetube 3 and the tube plates 4, 7 are sealed and fixed, and the flexibleconnection of the heat exchange tube 3 and the tube plates 4, 7 isrealized. Therefore, the packaging method of the tubular heat exchanger10 can quickly connect multiple heat exchange tubes 3 to the tube plates4, 7. The packaging method is convenient to complete the connection andsealing of the heat exchange tube 3 and the tube plates 4, 7 at the sametime, and is suitable for the processing technology of metal ornon-metallic tubular heat exchanger. Therefore, the packaging method ofthe tubular heat exchanger 10 can complete the packaging at one time,which saves time and effort, can realize large-scale processing, anddoes not affect the use and lifespan of the tubular heat exchanger 10.

Moreover, since rubber is used to seal and fix the heat exchange tube 3and the tube plates 4, 7, the requirements for the shape of the heatexchange tube 3 are greatly reduced, and the diameter and the tube wallof the heat exchange tube 3 can be thinner. The tubular heat exchanger10 with thinner and thinner heat exchange tubes 3 has better heatdissipation effect.

When the areas of the upper tube plate box 1 and the lower tube platebox 11 are large, the tie rod 2 is set between the upper tube plates 4and the lower tube plates 7 of the upper tube plate box 1 and the lowertube plate box 11 to rigidly fix the upper tube plate 4 and the lowertube plate 7, which can prevent the deformation of the upper tube plate4 and the lower tube plate 7, maintain the pressure in the cavities ofthe upper tube plate box 1 and the lower tube plate box 11, and increasethe rigidity of the upper tube plate box 1 and the lower tube plate box11.

The packaging method of the tubular heat exchanger 10 of the presentapplication is mainly aimed at the connection between the heat exchangetube 3 and the tube plates 4, 7, and is suitable for low-temperatureflue gas waste heat recovery, sewage treatment and other fields. Thematerial of the heat exchange tube 3 can be a metal tube or a non-metaltube. The pipe diameter has a wide variation range, and the heatexchange tube 3 can work under normal pressure, slightly positivepressure, or negative pressure.

It is to be understood that the above-described embodiments are intendedto illustrate rather than limit the disclosure. Any elements describedin accordance with any embodiments is understood that they can be usedin addition or substituted in other embodiments. Embodiments can also beused together. Variations may be made to the embodiments withoutdeparting from the spirit of the disclosure. The above-describedembodiments illustrate the scope of the disclosure but do not restrictthe scope of the disclosure.

Depending on the embodiment, certain of the steps of methods describedmay be removed, others may be added, and the sequence of steps may bealtered. It is also to be understood that the description and the claimsdrawn to a method may include some indication in reference to certainsteps. However, the indication used is only to be viewed foridentification purposes and not as a suggestion as to an order for thesteps.

What is claimed is:
 1. A packaging method of a tubular heat exchanger,comprising: S1, arranging an upper tube plate box, a lower tube platebox, and a plurality of heat exchange tubes, wherein each of the uppertube plate box and the lower tube plate box defines a plurality ofopenings, and the plurality of heat exchange tubes extends through theplurality of openings; S2, filling the upper tube plate box and thelower tube plate box with a liquid sealing rubber, wherein the liquidsealing rubber is filled in a gap between the plurality of heat exchangetubes and the upper tube plate box, and a gap between the plurality ofheat exchange tubes and the lower tube plate box; and curing the liquidsealing rubber, so that the plurality of heat exchange tubes is fixed inthe upper tube plate box and the lower tube plate box; and S3,installing a pressure bolt on the upper tube plate box and the lowertube plate box to apply and adjust a sealing pressure.
 2. The packagingmethod of claim 1, wherein in the step S1, each of the upper tube platebox and the lower tube plate box comprises an upper tube plate, a lowertube plate, and a side plate, the upper tube plate, the lower tubeplate, and the side plates cooperatively form a cavity; and placing atie rod between the upper tube plate and the lower tube plate along anaxial direction of the plurality of heat exchange tubes.
 3. Thepackaging method of claim 1, wherein two ends of the tie rod arerespectively welded to the upper tube plate and the lower tube plate bya welding connection, a screw connection or a bolt-nut connection. 4.The packaging method of claim 1, wherein in the step S2, a viscosity ofthe liquid sealing rubber ranges from 500 mpa·s to 100000 mpa·s.
 5. Thepackaging method of claim 1, wherein in the step S2, a viscosity of theliquid sealing rubber ranges from 2000 mpa·s to 20000 mpa·s.
 6. Thepackaging method of claim 1, wherein each of the upper tube plate boxand the lower tube plate box is formed by mechanical cutting and weldingprocessing, or 3D printing.